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How to do the thinking questions on page 42 of the second volume of the fourth grade mathematics book of Jiangsu Education Edition?
3/3+3-3= 1

3/3+3/3=2

3*3-3-3=3

(3*3+3)/3=4

(3+3)/3+3=5

3+3+3-3=6

3/3+3+3=7

3*3-3/3=8

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